Abstract. Biofuels are more and more popular energy source and they are used in more households in the Eastern Europe region. Straw from the agriculture crops is promising and significant biomass source of energy but now it is at least energy utilized. In terms of straw burning is the most important feature of its quick and easy volatilization. Another property, which is negative, is its low ash fusion temperature. The straw ash begin soften at about 830 °C. However, at the temperature 850 °C to 900 °C the ash transform to glass slags and sinters which damage the refractory of the furnace and it is also difficult to remove. The paper deals about the option for reducing the problems of low ash fusion temperature by additives application. The presented results are from the lime application in the laboratory conditions and in the real conditions, in the heat source with the nominal thermal power 2 MW. The results of the experiments showed that the results from the real operation does not correspond with laboratory results.

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